In this paper, we have successfully synthesized a structurally novel heteropolytungstate via coordination of four {Ru(C₆H₆)} and trivacant {TeW₉O₃₃} clusters, formulated as Cs₄Na₂H₂[Te₂W₂₀O₇₂(H₂O){(C₆H₆)Ru}₄]·12H₂O (1). Compound 1 inherited the strong absorption of [Ru(C₆H₆)Cl₂]₂ in the visible region and {TeW₉O₃₃} in the UV region, providing a good basis for photocatalysis. As expected, compound 1 showed good photocatalytic activity in the visible-light-driven reduction of nitrobenzene using N₂H₄·H₂O as a reductant with a yield of 99.8%, a high turnover number (TON = 330), and a high turnover frequency (TOF = 24 h^–1). The cyclic experiment of nitrobenzene reduction indicated that compound 1 was an effective and stable heterogeneous catalyst. Finally, the nitrobenzene reduction pathway was affirmed using condensation with azobenzene as a reaction intermediate based on control experiments.

中文翻译：

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有趣的 {Ru(C6H6)} 基杂多钨酸盐光催化还原硝基苯为苯胺

在本文中，我们通过四个{Ru(C ₆ H ₆ )}和三空位{TeW ₉ O ₃₃ }簇的配位成功合成了一种结构新颖的杂多钨酸盐，其公式为Cs ₄ Na ₂ H ₂ [Te ₂ W ₂₀ O ₇₂ (H ₂ O){(C ₆ H ₆ )Ru} ₄ ]·12H ₂ O( 1 )。化合物1继承了[Ru(C ₆ H ₆ )Cl ₂ ] ₂在可见光区和{TeW ₉ O ₃₃ }在紫外区的强吸收，为光催化提供了良好的基础。正如预期的那样，化合物1在可见光驱动的 N ₂ H ₄ ·H ₂ O 作为还原剂的硝基苯还原反应中表现出良好的光催化活性，产率达 99.8%，具有较高的周转数 (TON = 330) 和高周转频率（TOF = 24 h ^–1）。硝基苯还原的循环实验表明化合物1是一种有效且稳定的多相催化剂。最后，基于对照实验，以偶氮苯作为反应中间体缩合，确认了硝基苯的还原途径。